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[deliverable/binutils-gdb.git] / gas / config / tc-ppc.h
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252b5132 1/* tc-ppc.h -- Header file for tc-ppc.c.
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2 Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
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4 Written by Ian Lance Taylor, Cygnus Support.
5
6 This file is part of GAS, the GNU Assembler.
7
8 GAS is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
11 any later version.
12
13 GAS is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with GAS; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
21 02111-1307, USA. */
22
23#define TC_PPC
24
25#ifdef ANSI_PROTOTYPES
26struct fix;
27#endif
28
29/* Set the endianness we are using. Default to big endian. */
30#ifndef TARGET_BYTES_BIG_ENDIAN
31#define TARGET_BYTES_BIG_ENDIAN 1
32#endif
33
34#ifndef BFD_ASSEMBLER
35 #error PowerPC support requires BFD_ASSEMBLER
36#endif
37
38/* If OBJ_COFF is defined, and TE_PE is not defined, we are assembling
39 XCOFF for AIX or PowerMac. If TE_PE is defined, we are assembling
40 COFF for Windows NT. */
41
42#ifdef OBJ_COFF
43#ifndef TE_PE
44#define OBJ_XCOFF
45#endif
46#endif
47
48/* The target BFD architecture. */
49#define TARGET_ARCH (ppc_arch ())
7f6d05e8 50#define TARGET_MACH (ppc_mach ())
252b5132 51extern enum bfd_architecture ppc_arch PARAMS ((void));
7f6d05e8 52extern unsigned long ppc_mach PARAMS ((void));
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53
54/* Whether or not the target is big endian */
55extern int target_big_endian;
56
57/* The target BFD format. */
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58#define TARGET_FORMAT (ppc_target_format ())
59extern char* ppc_target_format ();
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60
61/* Permit temporary numeric labels. */
62#define LOCAL_LABELS_FB 1
63
64/* $ is used to refer to the current location. */
65#define DOLLAR_DOT
66
67/* Strings do not use backslash escapes under COFF. */
68#ifdef OBJ_COFF
69#define NO_STRING_ESCAPES
70#endif
71
72#ifdef OBJ_ELF
73#define DIFF_EXPR_OK /* foo-. gets turned into PC relative relocs */
74#endif
75
76#if TARGET_BYTES_BIG_ENDIAN
77#define PPC_BIG_ENDIAN 1
78#else
79#define PPC_BIG_ENDIAN 0
80#endif
81
82/* We don't need to handle .word strangely. */
83#define WORKING_DOT_WORD
84
85/* We set the fx_done field appropriately in md_apply_fix. */
86#define TC_HANDLES_FX_DONE
87\f
88#ifdef TE_PE
89
90/* Question marks are permitted in symbol names. */
91#define LEX_QM 1
92
93/* Don't adjust TOC relocs. */
94#define tc_fix_adjustable(fixp) ppc_pe_fix_adjustable (fixp)
95extern int ppc_pe_fix_adjustable PARAMS ((struct fix *));
96
97#endif
98
99#ifdef OBJ_XCOFF
100
101/* Declarations needed when generating XCOFF code. XCOFF is an
102 extension of COFF, used only on the RS/6000. Rather than create an
103 obj-xcoff, we just use obj-coff, and handle the extensions here in
104 tc-ppc. */
105
106/* We need to keep some information for symbols. */
107struct ppc_tc_sy
108{
109 /* We keep a few linked lists of symbols. */
49309057 110 symbolS *next;
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111 /* Non-zero if the symbol should be output. The RS/6000 assembler
112 only outputs symbols that are external or are mentioned in a
113 .globl or .lglobl statement. */
114 int output;
115 /* The symbol class. */
116 int class;
117 /* The real name, if the symbol was renamed. */
118 char *real_name;
119 /* For a csect symbol, the subsegment we are using. This is zero
120 for symbols that are not csects. */
121 subsegT subseg;
122 /* For a csect or common symbol, the alignment to use. */
123 int align;
124 /* For a function symbol, a symbol whose value is the size. The
125 field is NULL if there is no size. */
49309057 126 symbolS *size;
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127 /* For a csect symbol, the last symbol which has been defined in
128 this csect, or NULL if none have been defined so far. For a .bs
129 symbol, the referenced csect symbol. */
49309057 130 symbolS *within;
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131};
132
133#define TC_SYMFIELD_TYPE struct ppc_tc_sy
134
135/* We need an additional auxent for function symbols. */
136#define OBJ_COFF_MAX_AUXENTRIES 2
137
138/* Square and curly brackets are permitted in symbol names. */
139#define LEX_BR 3
140
141/* Canonicalize the symbol name. */
142#define tc_canonicalize_symbol_name(name) ppc_canonicalize_symbol_name (name)
143extern char *ppc_canonicalize_symbol_name PARAMS ((char *));
144
145/* Get the symbol class from the name. */
146#define tc_symbol_new_hook(sym) ppc_symbol_new_hook (sym)
49309057 147extern void ppc_symbol_new_hook PARAMS ((symbolS *));
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148
149/* Set the symbol class of a label based on the csect. */
150#define tc_frob_label(sym) ppc_frob_label (sym)
49309057 151extern void ppc_frob_label PARAMS ((symbolS *));
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152
153/* TOC relocs requires special handling. */
154#define tc_fix_adjustable(fixp) ppc_fix_adjustable (fixp)
155extern int ppc_fix_adjustable PARAMS ((struct fix *));
156
157/* A relocation from one csect to another must be kept. */
158#define TC_FORCE_RELOCATION(FIXP) ppc_force_relocation (FIXP)
159extern int ppc_force_relocation PARAMS ((struct fix *));
160
161/* We need to set the section VMA. */
162#define tc_frob_section(sec) ppc_frob_section (sec)
163extern void ppc_frob_section PARAMS ((asection *));
164
165/* Finish up the symbol. */
166#define tc_frob_symbol(sym, punt) punt = ppc_frob_symbol (sym)
49309057 167extern int ppc_frob_symbol PARAMS ((symbolS *));
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168
169/* Finish up the entire symtab. */
170#define tc_adjust_symtab() ppc_adjust_symtab ()
171extern void ppc_adjust_symtab PARAMS ((void));
172
173/* Niclas Andersson <nican@ida.liu.se> says this is needed. */
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174extern int ppc_subseg_align PARAMS ((void));
175#define SUB_SEGMENT_ALIGN(SEG) ppc_subseg_align()
252b5132 176
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177/* We also need to copy, in particular, the class of the symbol,
178 over what obj-coff would otherwise have copied. */
179#define OBJ_COPY_SYMBOL_ATTRIBUTES(dest,src) \
180do { \
181 if (SF_GET_GET_SEGMENT (dest)) \
182 S_SET_SEGMENT (dest, S_GET_SEGMENT (src)); \
183 symbol_get_tc (dest)->size = symbol_get_tc (src)->size; \
184 symbol_get_tc (dest)->align = symbol_get_tc (src)->align; \
185 symbol_get_tc (dest)->class = symbol_get_tc (src)->class; \
186 symbol_get_tc (dest)->within = symbol_get_tc (src)->within; \
187} while (0)
188
189
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190#endif /* OBJ_XCOFF */
191
192#ifdef OBJ_ELF
193
194/* Branch prediction relocations must force relocation, as must
195 the vtable description relocs. */
196#define TC_FORCE_RELOCATION(FIXP) \
197((FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRTAKEN \
198 || (FIXP)->fx_r_type == BFD_RELOC_PPC_B16_BRNTAKEN \
199 || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRTAKEN \
200 || (FIXP)->fx_r_type == BFD_RELOC_PPC_BA16_BRNTAKEN \
201 || (FIXP)->fx_r_type == BFD_RELOC_VTABLE_INHERIT \
202 || (FIXP)->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
203
204#define TC_FORCE_RELOCATION_SECTION(FIXP,SEC) \
205(TC_FORCE_RELOCATION (FIXP) \
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206 || ((FIXP)->fx_addsy && !(FIXP)->fx_subsy \
207 && S_GET_SEGMENT ((FIXP)->fx_addsy) != SEC))
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208
209/* Support for SHF_EXCLUDE and SHT_ORDERED */
210extern int ppc_section_letter PARAMS ((int, char **));
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211extern int ppc_section_type PARAMS ((char *, size_t));
212extern int ppc_section_word PARAMS ((char *, size_t));
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213extern int ppc_section_flags PARAMS ((int, int, int));
214
215#define md_elf_section_letter(LETTER, PTR_MSG) ppc_section_letter (LETTER, PTR_MSG)
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216#define md_elf_section_type(STR, LEN) ppc_section_type (STR, LEN)
217#define md_elf_section_word(STR, LEN) ppc_section_word (STR, LEN)
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218#define md_elf_section_flags(FLAGS, ATTR, TYPE) ppc_section_flags (FLAGS, ATTR, TYPE)
219
220/* Add extra PPC sections -- Note, for now, make .sbss2 and .PPC.EMB.sbss0 a
221 normal section, and not a bss section so that the linker doesn't crater
222 when trying to make more than 2 sections. */
223#define ELF_TC_SPECIAL_SECTIONS \
224 { ".tags", SHT_ORDERED, SHF_ALLOC }, \
225 { ".sdata", SHT_PROGBITS, SHF_ALLOC + SHF_WRITE }, \
226 { ".sbss", SHT_NOBITS, SHF_ALLOC + SHF_WRITE }, \
227 { ".sdata2", SHT_PROGBITS, SHF_ALLOC }, \
228 { ".sbss2", SHT_PROGBITS, SHF_ALLOC }, \
229 { ".PPC.EMB.sdata0", SHT_PROGBITS, SHF_ALLOC }, \
230 { ".PPC.EMB.sbss0", SHT_PROGBITS, SHF_ALLOC },
231
232#define tc_comment_chars ppc_comment_chars
233extern const char *ppc_comment_chars;
234
235/* Keep relocations relative to the GOT, or non-PC relative. */
236#define tc_fix_adjustable(FIX) \
237 ((FIX)->fx_r_type != BFD_RELOC_16_GOTOFF \
238 && (FIX)->fx_r_type != BFD_RELOC_LO16_GOTOFF \
239 && (FIX)->fx_r_type != BFD_RELOC_HI16_GOTOFF \
240 && (FIX)->fx_r_type != BFD_RELOC_HI16_S_GOTOFF \
241 && (FIX)->fx_r_type != BFD_RELOC_GPREL16 \
242 && (FIX)->fx_r_type != BFD_RELOC_VTABLE_INHERIT \
243 && (FIX)->fx_r_type != BFD_RELOC_VTABLE_ENTRY \
244 && ! S_IS_EXTERNAL ((FIX)->fx_addsy) \
245 && ! S_IS_WEAK ((FIX)->fx_addsy) \
246 && ((FIX)->fx_pcrel \
247 || ((FIX)->fx_subsy != NULL \
248 && (S_GET_SEGMENT ((FIX)->fx_subsy) \
249 == S_GET_SEGMENT ((FIX)->fx_addsy))) \
e0accf0c 250 || S_IS_LOCAL ((FIX)->fx_addsy)))
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251
252/* We must never ever try to resolve references to externally visible
253 symbols in the assembler, because the .o file might go into a shared
254 library, and some other shared library might override that symbol. */
255#define TC_RELOC_RTSYM_LOC_FIXUP(FIX) \
256 ((FIX)->fx_addsy == NULL \
257 || (! S_IS_EXTERNAL ((FIX)->fx_addsy) \
258 && ! S_IS_WEAK ((FIX)->fx_addsy) \
259 && S_IS_DEFINED ((FIX)->fx_addsy) \
260 && ! S_IS_COMMON ((FIX)->fx_addsy)))
261
262#endif /* OBJ_ELF */
263
264/* call md_apply_fix3 with segment instead of md_apply_fix */
265#define MD_APPLY_FIX3
266
267/* call md_pcrel_from_section, not md_pcrel_from */
268#define MD_PCREL_FROM_SECTION(FIXP, SEC) md_pcrel_from_section(FIXP, SEC)
269extern long md_pcrel_from_section PARAMS ((struct fix *, segT));
270
271#define md_parse_name(name, exp) ppc_parse_name (name, exp)
272extern int ppc_parse_name PARAMS ((const char *, struct expressionS *));
273
274#define md_operand(x)
275
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